What if a single injection could lower blood levels of cholesterol and triglycerides — for a lifetime?

In the first gene-editing experiment of its kind, scientists have disabled two genes in monkeys that raise the risk for heart disease. Humans carry the genes as well, and the experiment has raised hopes that a leading killer may one day be tamed.

“This could be the cure for heart disease,” said Dr. Michael Davidson, director of the Lipid Clinic at the University of Chicago Pritzker School of Medicine, who was not involved in the research.

But it will be years before human trials can begin, and gene-editing technology so far has a mixed tracked record. It is much too early to know whether the strategy will be safe and effective in humans; even the monkeys must be monitored for side effects or other treatment failures for some time to come.

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